3. A packaging system fills boxes to an average weight of 15 ounces with a standard deviation of 0.5 ounce. It is reasonable to assume that the weights are normally distributed. Select an R command that computes the third quartile of the box weight. A. pnorm(0.75, 0, 1) B. pnorm(0.25, 15, 0.5) C. qnorm (0.25, 15, 0.5) D. qnorm(0.75, 15, 0.5)